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Geologic Hazards


Volcanoes, earthquakes, tsunamis, landslides, expansive soils and more


Volcanoes
Volcanoes
Volcanoes Articles about volcanoes, volcanic hazards and eruptions past and present.
Landslides
Landslides
Landslides A USGS fact sheet about landslides and events that trigger them.
Largest Hurricanes
Largest Hurricanes
Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Geology Tools
Geology Tools
Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Expansive Soils
Expansive Soils
Expansive Soil Causes more damage than floods, hurricanes & tornadoes combined.
Lightning Hotspot
Lake Maracaibo Lightning
World Record Lightning - This lake has more lightning than any other place in the world.
Liquefaction
Liquefaction
Liquefaction occurs when water-saturated soil is severely shaken and loses strength.
Tsunami Causes
Tsunami Causes
What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis.
Impact Craters
Impact Craters
Asteroid Impact Craters! Zoom in on 50 of Earth\'s largest impact craters.
Largest Tsunami
Largest Tsunami
Largest Tsunami - The wave with the highest run-up was in Lituya Bay, Alaska.
Abandoned Mines
Abandoned Mines
Abandoned Mines accidents take 20 to 30 lives per year. Many could be prevented.
Naming Hurricanes
Hurricane Names
Hurricane Names How are hurricanes named? Is your name on the list?
Hazard Insurance
Hazard Insurance
Homeowners Insurance and Geologic Hazards Most policies do not cover geologic hazards.
San Andreas Map
San Andreas Map
Google Map of the San Andreas - Zoom in to see the fault trace plotted atop of a map.
Volcanic Explosivity
Volcanic Explosivity
Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.
Storm Surge
Storm Surge
Storm Surge can be the most damaging and deadly aspect of a hurricane.
Novarupta
Novarupta
Most Powerful Eruption of the 20th Century - and most people have never heard of it.
Lightning Strikes Map
lightning map
Lightning Strikes Map - shows the worldwide distribution of lightning activity.
Pacific Tsunamis
Pacific Tsunamis
Pacific Tsunamis This ocean is surrounded by plate boundaries, that can produce tsunami.
Rock Fall Photos
Yosemite Rock Fall Photos
Yosemite Rock Fall Photos A photo sequence of a rockfall and debris avalanche by Herb Dunn.
Atlantic Tsunamis
Atlantic Tsunamis
Atlantic Tsunamis Rare events that can cause damage and threaten millions of people.
Yosemite Rockfall
Yosemite Rockfall Hazards
Yosemite Rockfall Hazards have been mapped by the National Park Service.
Indian Ocean Tsunamis
Indian Ocean Tsunamis
Indian Ocean Tsunamis Deadly tsunamis triggered by earthquakes and volcanoes.